title: The 27Al DOR NMR characterization of the molecular sieve AlPO4-8.
abstract: 27Al double rotation (DOR) NMR spectroscopy has been applied to investigate the framework ordering in the aluminophosphate molecular sieve AlPO4-8 during the hydration process. Relative well-resolved peaks in the DOR spectra of both dehydrated and successively rehydrated AlPO4-8 allow the isotropic shifts and the quadrupolar shifts to be correlated with the local framework structure. The rather complex interaction of water with AlPO4-8 occurs in a specific way, not randomly. For dehydrated AlPO4-8 efforts are shown to correlate respectively the isotropic shifts to the mean Al-O-P angles and the quadrupolar coupling constants to the shear strains of the different aluminium sites.
authors.affiliation: Centrum voor Oppervlaktechemie en Katalyse, K.U. Leuven, Belgium.
authors.forename: M
authors.initials: M
authors.lastname: Kovalakova
authors.forename: P J
authors.initials: PJ
authors.lastname: Grobet
mesh_terms: D000535:Aluminum; D017607:Aluminum Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010710:Phosphates / Q000737:chemistry*
chemical_list: D017607:Aluminum Compounds; D010710:Phosphates; D000535:Aluminum; C012714:aluminum phosphate